Add JvmDefault to the new EP method for compatibility with older impls

libraries/scripting/intellij/build.gradle.kts

@@ -4,7 +4,7 @@ plugins {
     id("jps-compatible")
 }
 
-jvmTarget = "1.6"
+jvmTarget = "1.8"
 
 dependencies {
     compile(project(":kotlin-script-runtime"))

libraries/scripting/intellij/src/kotlin/script/experimental/intellij/scriptDefinitionProvider.kt

@@ -48,6 +48,7 @@ interface ScriptDefinitionsProvider {
     /**
      * The callback to update/add/remove script definitions after loading, if needed
      */
+    @JvmDefault
     fun provideDefinitions(
         baseHostConfiguration: ScriptingHostConfiguration,
         loadedScriptDefinitions: List<ScriptDefinition>